1973 OPEL GT-R Wheel torque

ENGINE MECHANICAL AND MOUNTS6A- 11
a. Attach left chain to alternator support rear bolt.
b. Bolt right chain to existing threaded hole at lower
right front of engine.
2. Assemble loose ends of chain to support device J-bolts and adjust to remove engine weight from motor
mounts.
3. Remove the two motor mount bracket to motor
mount retaining nuts.
4. Remove the two front suspension to frame rail bolt
retaining nuts.
5. Remove nut and bolt at lower end of steering shaft
U-joint.
6. With a floor jack under the center of the front
suspension cross member, raise car high enough for
wheels and suspension assembly to be rolled from
under car.
7. Position jack stands under both front jack brackets
on underbody to support car in this position.
8. Remove both front cross member support to frame
attaching bolts.
9. Remove brake pipe to brake hose retaining clips
at frame rails and disconnect brake hose from brake
pipes. Use an absorbent material or suitable con-
tainer for the brake fluid that will drain out.
10. Lower the front suspension assembly and remove
from under car.
11. Drain engine oil and remove oil pan and gasket.
Installation (Opel 1900 and Manta)1. Apply a light bead of sealer to the clean sealing
surfaces of the oil pan and affix a new gasket.
2. Bolt oil pan and gasket assembly to engine block.
3. Roll front suspension and floor jack under car and
raise into position careful to pilot the cross member
to frame rail attaching bolts and steering shaft to
their respective locations.
4. Install cross member’support to frame attaching
bolts and torque to 22 lb.ft.
5. Connect brake hose to brake pipes and install
retaining clips.
6. Bleed front brake system. Maintain brake fluid1Wd.
7. Remove jack stands and lower car.8. Install suspension to frame rail bolt retaining nuts.
9. Release and remove engine supporting device.
10. Install motor mount bracket to motor mount
retaining nuts.
11. Install steering shaft U-joint lower bolt and nut.
12. Replace engine oil.
Removal (GT Series)1. Support engine in vehicle using Tool J-23375. See
Figure 6A- 15.
Figure 6A-15 Engine Holding Fixture
Install tool by removing upper engine mount nut and
installing fixture. Replace nut and tighten. The en-
gine will now be supported by the tool, between the
frame rails. The front suspension need not be
removed on GT Models.
2. Drain oil.
3. Remove oil pan bolts and remove oil.
Installation (GT Series)1. Replace oil pan and bolts.
2. Remove engine holding fixture and replace engine
mounts.
3. Replace engine oil.

6A- 18 1973 OPEL SERVICE MANUAL
pressure. If heavy pressure is required, shell was not
started squarely and will be distorted if force into place.
12. Place lower bearing shell in bearing cap, then
check clearance
with plastic-type gauge, as previ-
ously described.
13. The desired clearance with a new bearing is
.0009” to .0025”. If this clearance cannot be obtained
with a standard size bearing, insert an undersize
bearing and check again
w&h plastic-type gauge
material.
14. When the proper size bearing has been selected,
clean out all plastic gauge material, oil the lower
shell and reinstall bearing cap. Clean the bolt holes
and lube bolts, then torque cap bolts to 72 lb. ft. The
crankshaft should turn freely at flywheel rim; how-
ever, a very slight drag is permissible if an undersize
bearing is used.
15. If the thrust bearing shell is disturbed or replaced
it is necessary to line up the thrust surfaces of the
bearing shell before the cap bolts are tightened. To
do this, move the crankshaft fore and aft the limit of
its travel several times (last movement fore) with the
thrust bearing cap bolts finger tight.
16. After bearing is installed and tested, loosen all
bearing cap bolts
l/2 turn and continue with other
bearings. When bearings have been installed and
tested, tighten all bearing cap bolts to 72 lb. ft.
17. Replace rear bearing oil seals.
18. Install pipe and screen assembly and oil pan.
Installation of Rear Bearing Oil
Seals (Engine in Vehicle)
1. Remove transmission, bell housing and clutch.
Refer to appropriate section for removal procedures.
Figure 6A-28 Removing Rear Main Oil Seal
2. Remove flywheel.
3. Punch a hole into oil seal and screw in a sheet
metal screw and pull out oil seal. See Figure
6A-28.
4. To insure proper sealing, lubricate seal with a
suitable protective grease and install on taper ring
J-22928. Turn seal to ensure lip of seal is not turned
back. See Figure
6A-27.
OIL SEAL’6A-29
Figure
6A-29 Installing Oil Seal on Tool J-22928
5. Place tapered ring with oil seal on crankshaft
flange and move lip of seal
over rear of crankshaft.
Be careful not to tilt seal.
Figure 6A-30 Installing Rear Main Bearing Oil Seal
6. Drive in oil seal using Tool J-22928-2. See Figure
6A-30.
7. Install flywheel, clutch, bell housing and transmis-
.

ENGINE MECHANICAL AND MOUNTS6A- 19
sion. When replacing flywheel use new bolts and
torque to 43 lb.ft.
PISTON, RINGS AND CONNECTING RODS
Removal and Disassembly of Piston
and Rod Assemblies
1. Drain oil.
2. Remove oil pan. 3. Remove cylinder head.
4. Examine the cylinder bores above the ring travel.
If bores are worn so a ridge exists, remove the ridges
with a ridge reamer to avoid damaging rings or
cracking ring lands in pistons during removal.
5. Mark the cylinder number on all pistons, connect-
ing rods and caps. Starting at the front end of the
crankcase, the cylinders are numbered l-2-3-4,
6. Remove cap and bearing shell from number 1
connecting rod.
7. Push the piston and
rod assembly up and out of
top cylinder. Then reinstall cap and bearing shell on
rod.
0
-J-23436-4
J-23436-2+
J-6047
Figure
6A-3 1 Piston Pin Removal Tool Layout - 1 .S
Engine
8. Remove other rod and piston assemblies in the
same manner.
9. Remove compression rings and oil rings.
10. Remove piston pin in following manner:
a. Position base support J-6047 on hydraulic press.
b. Place tool J-23436-2 in base support with large
diameter bore facing upward. See Figure
6A-31.
c. Position piston and rod assembly on tool
J-
23436-2 making certain the pin is aligned on tool.
d. Position tool J-23436-4 in opposite end of piston
pin and press pin out.
Inspection of Cylinder Bores
Inspect cylinder walls for scoring, roughness, or
ridges which indicate excessive wear. Check cylinder
bores for taper and out-of-round with an accurate
cylinder gage at top, middle and bottom
ofbore, both
parallel and at right angles to the centerline of the
engine. The diameter of the cylinder bores at any
point may be measured with an inside micrometer or
by setting the cylinder gauge dial at “0” and measur-
ing across the gauge contact points with outside mi-
crometer while the gauge is at the same “0” setting.
If a cylinder bore is moderately rough or slightly
scored but is not out-of-round or tapered, it is possi-
ble to repair the bore by honing to accept a standard
service piston. If cylinder bore is very rough or deeply scored, it may be necessary to rebore the cyl-
inder to fit an oversize piston in order to insure satis-
factory results.
If a cylinder bore is tapered
.ooO5” or more, or is
out-of-round
.0005” or more, it is advisable to hone
or rebore for the smallest possible oversize piston and
rings.
Visual Inspection of Pistons, Rings, and Pins
Clean carbon from piston surfaces and under side of
piston heads. Clean carbon from ring grooves with a
suitable tool and remove any gum or varnish from
piston skirts with suitable solvent.
Carefully examine pistons for rough or scored bear-
ing surfaces, cracks in skirt, head cracked or broken
ring lands, and chipping or uneven wear which
would cause rings to seat improperly or have exces-
sive clearance in ring grooves. Damaged or faulty
pistons should be replaced.
Fitting Pistons to Cylinders
The pistons are cam ground, which means that the

6A- 28 1973 OPEL SERVICE MANUAL
Part
ConnectingRod Bolts..........................................................
Crankshaft Main Bearing Bolts
..........................................
FlywheeltoCrankshaft AttachingBolts..........................
Cylinder Head Attaching Bolts....Cold 72 -Warm 58
Camshaft Sprocket Attaching Bolts................................
Generator Bracket to Cylinder Block
Attaching Bolts ..................................................................
Generator Bracket to Timing Case Attaching Bolts
....
Crankshaft Pulley Attaching Bolts ....................................
Rocker Arm Stud in Cylinder Head ..................................
Spark Plugs ........................................................................\
....
Clutch Housing to Cylinder Block Attaching Bolts
......
Timing Case to Cylinder Block AttachingBolts ............
Water Pump to Timing Case AttachingBolts................
Engine Support to Cylinder Block Attaching Bolts
......
Rear Engine Suspension to Transmission Rear Bearing Retainer Bolts ....................................................
Transmission to Clutch Housing Attaching Bolts
........
Starter to ClutchHousing AttachingBolts....................
Support to Starter Attaching Nut
....................................
Intake and Exhaust Manifold to Cylinder Head Attaching Bolts ..................................................................
Unless Otherwise Noted:
10
@i Bolt (15 MM Hall.....................................................................- -
36
72
43
18
;i
72
29
30
36
14
11
40
22
29
40
4
33 ............30
8 MM Bolt (13 MM Head)........................................................................\
........................................................................\
........................................15
6 MM Bolt (10 MM Head)
30 Lb.In.
Torque
Lb.Ft.
GENERAL SPECIFICATIONS
Type - No. of Cylinders
Valve Arrangement........................................................................\
........................................................................\
......................................................I;nlinzai
Bore and Stroke Piston Displacement Cu. In.
........
3.66 x1:;:;
Compression Ratio......................................................................................\
........................................................................\
........................................................................\
........................................
\fô\
²…..............7.6:1Octane Requirement........................................................................\
..........
Firing Order........................................................................\
........................
Regular - Lo;-?::
....................Cylinder Block Material....... ...............................................................................\
..............................................Cast Iron
Crankshaft Bearings Number and Type 5 Removable Steel Backed
In-Metal Babbitts
Bearing Which Takes End Thrust
........................................................................\
...................5
Connecting Rod Bearing Material
........................................................................\
..................
Steel Backed Tri-Metal Babbttts
Piston Material and Surface Aluminum Alloy, Lead Coated
Piston Pin Offset
........................................................................\
............,031 In. to the RightCompression Rings Material and Surface Treatment
No.
1....... ........... ............... ........ ............. ................Chrome-plated, Cast Iron
- Rectangular
No. 2
........................................................................\
..............................Cast Iron - Tapered
Oil Ring
........................................................................\
..................Chrome-plated, Cast Ir?n
Location of All Piston Rings
........................................................................\
Above Ptston Pm
Camshaft Material
........................................................................\
....................Alloy Cast Iron
Camshaft Drive........................................................................\
........................................Chajn
Number and Type of Camshaft Bearings 4 Steel-Backed Babbttt
Valve Lifter Type
..............................................................................................\
..........................................~..........Hydraulic
Oiling System Tvoe........................................................................\
Circulatmg High Pressure
Oil
&ppiied to: - .
Bearing Surfaces, Crankshaft, Camshaft and Connecting Rods............................Pressure
Piston, Pins
........................................................................\
............................................Vapor
Cvlinder Walls........................................................................\
..........................Nozzle Spray
Rocker Arms _,,,..,,....,._..___.,,..,,..............,,,,...,.......,..,,,.,.,,.....\
....,,...,.,.................~...... Pressure
Oil Reservoir Capacity
- Quarts .,,,...,,__.,,..,..,,..,...,..,,,...,,..............,,,... 3 l/4 With Dry Fdter
Oil Filter
- Type ,,....,__.,,...,....,....,,..,,,..,,...........,........................\
............ Throw Away Element

7A- 61973 OPEL SERVICE MANUAL1. FIywheeI and Pressure PlateExamine friction surfaces of flywheel and pressure
plate for scoring or roughness. Slight roughness may
be smoothed with fine emery cloth, but if surface is
deeply scored or grooved the part should be re-
placed.
2.
CJutch Driven Plate
Inspect driven plate for condition of facings, loose
rivets, broken or very loose torsional springs.
If facings are worn down near rivets or are oily, the
plate assembly should be replaced. A very slight
amount of oil on clutch facings will cause clutch grab
and chatter. A large amount of oil on facings will
cause slippage. Removal of oil by solvents or by buff-
ing is not practical since oil will continue to bleed
from facing material when hot.
When oil is found on driven plate facings, examine
transmission drainback hole, pilot bushing, engine
rear main bearing and other points of possible oil
leakage.
Test the fit of driven plate hub on transmission main
drive gear for an easy sliding fit.
Regardless of whether the old plate or a new one is
to be installed, the plate should be checked for run-
out. Lateral run-out measured at disc circumference
should not exceed
.016 inch.
Inspect clutch release bearing for scoring or exces-
sive wear on front contact face. Test for roughness of
balls and races by pressing and turning front race
slowly. Inspect main drive gear pilot bushing in
crankshaft. If bushing is rough or worn it should be
Figure JA-3replaced. If replacement is necessary, remove bear-
ing with Tool J-21718 and Slide Hammer J-7004-1.
Install new bearing using J-21706. See Figure 7A-3
for removal procedure and Figure 7A-4 for installa-
tion.
\,,
Figure JA-4
Installation of Clutch1. Index alignment marks on clutch assembly and
flywheel. Place driven plate on pressure plate with
long end of splined hub facing forward toward the
flywheel. See Figure 7A-5.
2. Insert alignment Tool J-22934 through clutch
cover and driven plate.
3. Hold complete assembly against flywheel while
inserting end of Tool J-22934 into pilot bearing in
crankshaft.
4. Index the alignment marks and install four (4)
clutch cover to flywheel bolts finger tight. Complete
torquing bolts alternately and evenly one at a time.
5. Torque attaching bolts to 36 lb.ft. and remove
alignment tool.
6. Install release bearing.
7. Install flywheel housing and torque lower bolts to
36
lb.ft.8. Install flywheel housing lower cover.
9. Install clutch return spring and control cable.
10. Install transmission. See Manual Transmission
Section for procedure.
11. Adjust clutch control cable. Refer to paragraph7A-3.

Installation1. FLYWHEEL
2. CLUTCH ASSEMBLY
3. ASSEMBLY MARKS
4. CLUTCH ALIGNING
ARBOR J-229347A-51. Slide control cable ball end through eye in clutch
housing. Connect to lever and (on GT) install return
spring.
2. Replace washers and rubber grommet, slide cable
through retainer on dash panel, and connect to
clutch pedal. To adjust, refer back to Clutch Adjust-
ment paragraph
c or d.
Figure
7A-5 Clutch Installation
SPECIFICATIONS
GENERAL SPECIFICATIONSE-l
I-‘-J- : ,“/’‘~Clutch Specifications
Type. . . . . . . . . . . . . . . . . . . .
Pedal Lash
_ 3/4” to l-1/4”-. -..-.
.........Single Plate - Dry Disc
unvenFlareuamerer.....................................................................................................6-3/4”
Driven Plate Facings
......................................................................................Woven Asbestos
Number of Facings
....................................................................................................................
2Facing Attachment
........................................................................................................Riveted
Vibration Dampening
..................................................................................4 Torsional Springs
Bolt Tightening SpecificationsCLUTCH CONTROL CABLE REMOVAL AND
INSTALLATION
(SEE FIGURE 7A.6
OR 7A-7)
If a new cable was installed or the cable adjustment
was changed during an operation, x-adjust cable
afterwards.
Removal
1. Disconnect return spring and cable with ball end
from release lever. Slide control cable out of eye in
clutch housing.
2. With a screwdriver, pry E-ring out of groove in
control cable, at tirewall, and disconnect cable from
clutch pedal.
3. Pull cable out of retainer on dash panel and
remove washers and rubber grommet.
PartLocationTorque
Lbs.Ft..’
BoltFlywheeltoCrankshaft........................................................43
/BoltClutchCovertoFlywheel....................................................36
BoltTransmissiontoClutchHousing......................................32.36;:
BoltStartertoClutchHousing..................................................40
NutSupport to Clutch Housing................................................4IBoltIntake and Exhaust Manifold to Cylindei Head............33

78.221973 OPEL SERVICE MANUAL
3. Install new bellows. Adhere to distance A
- 8.07”.
See Figure 7B-I 1.
4. Heat up new gearshift lever knob in boiling water
to 176 degrees F. and push it onto gearshift lever
tube. Adhere to distance A .3”, see Figure
7B-15.The gearshift lever tube end is provided with trans-
verse grooves for which reason the old button cannot
be reused. Install gearshift lever.
REPLACING RUBBER DAMPENING PARTS IN
GEARSHIFT LEVER1. Remove gearshift lever.
2. Knock off gearshift lever button and loosen
threaded pin for Bowden control wire attachment.
3. Remove lower snap ring from gearshift lever tube
and pull tube off shift finger.
4. Take off and replace rubber dampening parts.
5. After installation of tube, tighten Bowden control
wire with threaded pin. Prior to tightening, pull ring
must rest on gearshift lever tube and clamping block
on pull ring. See Figure
7B-15.6. Heat up new gearshift lever knob in boiling water
to 176 degrees F. and push it onto gearshift lever
tube. Adhere to distance A
- .3”, see Figure 7B-15.The gearshift lever tube end is provided with trans-
verse grooves for which reason the old button cannot
be reused.
7. Install gearshift lever.
MAJOR REPAIR
TRANSMISSION REMOVAL1. Remove air cleaner. Remove throttle rod from
carburetor and rear support and disconnect battery.
2. Remove screws from fan shroud.
3. Remove gearshift lever (refer to paragraph on ser-
vicing gearshift lever).
4. Support car with frame or wheel stands in the
front or frame stands in the rear.
5. Loosen front exhaust pipe to manifold flange.
6. Remove clutch cable from fork by pushing fork to
disengage the clutch and unsnap cable from slot.
7. Disconnect both wires from backup lamp switch.8. Disconnect speedometer cable from transmission
case extension housing.
9. Unhook parking brake cable return spring and
remove cable adjusting nut, equalizer, and spacer.
See Figure
7B-16.PARKING BRAKE CABLE
PARKING BRAKE
Figure 78-16 Parking Brake Equalizer and Return
Spring
9. Disconnect drive shaft at central joint and remove
as follows: See Figure
7B-16.a. Disconnect parking brake cable equalizer from
rod.b. Mark the mating parts of U-Joint and the drive
pinion extension shaft flange.
c. Loosen bolt locks and remove bolts or nuts.
d. Work propeller shaft slightly forward, lower rear
end of shaft and slide assembly rearward. Remove
thrust spring.
e. Install a plug in the rear of the transmission to
prevent loss of lubricant.
10. Remove rear engine mount bolts and lower trans-
mission as far as possible.
11. Remove transmission case to clutch housing at-
taching bolts and remove transmission.
INSTALLATION OF TRANSMISSION WITH
ENGINE IN CAR1. Make certain main drive gear splines are clean and
dry. Also, make certain the transmission is in Neu-
tral so that the main drive gear splines may be in-
dexed when making the installation.
2. Install transmission and support weight while in-
stalling transmission case to clutch housing bolts.
3. Install rear engine mount.
4. Install propeller shaft, align, and tighten U-Joint
to pinion flange U-Bolt nuts and torque to 11 lb. ft.

MANUAL TRANSMISSION70-33
Installing Gearshift Interlock Ball and Gearshift
Thrust Spring1. Install gearshift interlock ball into top transmis-
sion bore and then install gearshift thrust spring.
Installing Transmission Case Cover1. Install case cover gasket, cover, and tighten
screws.
Installing Gearshift Linkages1. Install selector ring and lock nut onto selector
shaft.2. Holding selector lever and support in place, torque
(2) bracket bolts and spring washers to 14.5 lb. ft. See
Figure
7B-55.3. Install pin securing selector lever to transmission
case extension bolt.Figure 78.55 Pin and Bracket Securing Selector
Lever to Intermediate Shaft and Bearing Retainer
4. Install shifter shaft with spring washers on inside
of shifter shaft ends and flat washers on outside ofshaft.5. Secure each end of shifter shaft and washers with
new cotter pins.
SPECIFICATIONS
TRANSMISSION SPECIFICATIONS
General SpecificationsType
................................................................Manual Shift 4 Speeds Forward - 1 Reverse
Synchronization
........................................................FullySynchronizedAllForwardSpeedsGear Ratios:
1st Gear
........................................................................................................................3.4282nd Gear
........................................................................................................................2.1563rd Gear
........................................................................................................................1.3664th Gear
........................................................................................................................
1.000Reverse
..........................................................................................................................3.317Lubricant Capacity
........................................................................................................2.5 pints
Lubricant Type
............................................SAE 80 or SO-90 Multi-Purpose Gear Lubricant
Torquing Specifications
Part
BoltBolt
Bolt
Bolt
Location
TransmissiontoFlywheel
(3) Rear Bearing Retainer to Transmission Case
(M&25)(2) Rear Bearing Retainer to Transmission Case(MBr30)
RearEngineMounttoUnderbody
Torque
Lbs.Ft.32.36
21
14.5
22